Primary and Secondary Wheels
The patterns on this page have non-trivial primary and secondary wheels.
It should be clear that there are fewer blue and red wheels in the diagrams
than there are circles moving around the hypocycloid.
(2,5,6)
(3,7,12)
(3,8,15)
(3,10,21)
(5,9,20)
(5,11,15)